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  <div class="section" id="windows-export-all-symbols">
<span id="prop_tgt:WINDOWS_EXPORT_ALL_SYMBOLS"></span><h1>WINDOWS_EXPORT_ALL_SYMBOLS<a class="headerlink" href="#windows-export-all-symbols" title="Permalink to this headline">¶</a></h1>
<p>This property is implemented only for MS-compatible tools on Windows.</p>
<p>Enable this boolean property to automatically create a module definition
(<code class="docutils literal notranslate"><span class="pre">.def</span></code>) file with all global symbols found in the input <code class="docutils literal notranslate"><span class="pre">.obj</span></code> files
for a <code class="docutils literal notranslate"><span class="pre">SHARED</span></code> library (or executable with <span class="target" id="index-0-prop_tgt:ENABLE_EXPORTS"></span><a class="reference internal" href="ENABLE_EXPORTS.html#prop_tgt:ENABLE_EXPORTS" title="ENABLE_EXPORTS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">ENABLE_EXPORTS</span></code></a>)
on Windows.  The module definition file will be passed to the linker
causing all symbols to be exported from the <code class="docutils literal notranslate"><span class="pre">.dll</span></code>.
For global <em>data</em> symbols, <code class="docutils literal notranslate"><span class="pre">__declspec(dllimport)</span></code> must still be used when
compiling against the code in the <code class="docutils literal notranslate"><span class="pre">.dll</span></code>.  All other function symbols will
be automatically exported and imported by callers.  This simplifies porting
projects to Windows by reducing the need for explicit <code class="docutils literal notranslate"><span class="pre">dllexport</span></code> markup,
even in <code class="docutils literal notranslate"><span class="pre">C++</span></code> classes.</p>
<p>When this property is enabled, zero or more <code class="docutils literal notranslate"><span class="pre">.def</span></code> files may also be
specified as source files of the target.  The exports named by these files
will be merged with those detected from the object files to generate a
single module definition file to be passed to the linker.  This can be
used to export symbols from a <code class="docutils literal notranslate"><span class="pre">.dll</span></code> that are not in any of its object
files but are added by the linker from dependencies (e.g. <code class="docutils literal notranslate"><span class="pre">msvcrt.lib</span></code>).</p>
<p>This property is initialized by the value of
the <span class="target" id="index-0-variable:CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS"></span><a class="reference internal" href="../variable/CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS.html#variable:CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS" title="CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS</span></code></a> variable if it is set
when a target is created.</p>
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